Combination motor-starter and circuit breaker

Details Combination motor-starter and circuit breaker Combination motor-starter and circuit breaker

H - Electricity

01

H

306/81

H01H 73/36 (2006.01) H01H 71/32 (2006.01) H01H 77/10 (2006.01)

Patent

CA 1077545

ABSTRACT OF THE DISCLOSURE A combination motor-starter circuit breaker comprising a single set of separable contacts and providing the function of motor starting, circuit interruption, and current limiting. The combination employs three separate means for separating the contacts to provide these functions; a solenoid, an overcurrent trip mechanism, and a magnetic drive devise for high overcurrent conditions. Arc rails and spaced conductive plates are provided to aid in extinguishing any arcs established. Movable contacts are mounted on a bridging contact arm which can be provided with two open positions, a first position for use during motor control wherein the contacts are separated by a relatively small distance and a second position for use during circuit interruption and current limiting. -1-

261231

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